Picture frame



FIG. 1 is a perspective view showing a picture frame showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is an enlarged partial view showing of an upper left corner portion of FIG. 1; and,

FIG. 9 is an enlarged partial view showing of an upper right corner portion of FIG. 1.

The broken lines in the figures are demarcating enlarged areas and form no part of the claimed design. 

CLAIM The ornamental design for a picture frame, as shown and described. 